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Amortization Expense for Future Years (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of the estimated amortization expense      
Year ended December 31, 2012   $ 99,917  
Year ended December 31, 2013   97,165  
Year ended December 31, 2014   83,200  
Year ended December 31, 2015   46,770  
Year ended December 31, 2016   36,267  
Thereafter   113,561  
Total $ 437,552 $ 476,880 $ 569,723